There seem to be many ideas on how to mark a plate for studs, there are also several tools you can buy to make stud spacing easier, but why not make your own? Granted, the easiest DIY is to cut a 2" x 4" to 14 1/2" long and use that, but they get stuck when driving nails. So take a 19" x 5" piece of 3/4" sheet goods, make a few cuts like the attached drawing, round a few edges for comfort and you've got a quality tool with a handle and perfect, repetitive spacing every time.
Stud spacing question for shed wall.
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Stud spacing for odd length shed floor
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